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<div class="titlepage"><div><div><h4 class="title">
<a name="boost_asio.overview.model.library_elements"></a><a class="link" href="library_elements.html" title="Supporting Library Elements">Supporting
        Library Elements</a>
</h4></div></div></div>
<p>
          The Boost.Asio asynchronous model is enabled by the library elements listed
          in the table below.
        </p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                  <p>
                    Library Element
                  </p>
                </th>
<th>
                  <p>
                    Description
                  </p>
                </th>
</tr></thead>
<tbody>
<tr>
<td>
                  <p>
                    <code class="computeroutput"><span class="identifier">completion_signature</span></code>
                    concept
                  </p>
                </td>
<td>
                  <p>
                    Defines valid completion signature forms.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <code class="computeroutput"><span class="identifier">completion_handler_for</span></code>
                    concept
                  </p>
                </td>
<td>
                  <p>
                    Determines whether a completion handler is callable with a given
                    set of completion signatures.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../../reference/async_result.html" title="async_result">async_result</a>
                    trait
                  </p>
                </td>
<td>
                  <p>
                    Converts a completion signature and completion token into a concrete
                    completion handler, and launches the operation.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../../reference/async_initiate.html" title="async_initiate">async_initiate</a>
                    function
                  </p>
                </td>
<td>
                  <p>
                    Helper function to simplify use of the <code class="computeroutput"><span class="identifier">async_result</span></code>
                    trait.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <code class="computeroutput"><span class="identifier">completion_token_for</span></code>
                    concept
                  </p>
                </td>
<td>
                  <p>
                    Determines whether a completion token produces a completion handler
                    for a given set of completion signatures.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../../reference/associator.html" title="associator">associator</a>
                    trait
                  </p>
                </td>
<td>
                  <p>
                    Automatically propagates all associators through layers of abstraction.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../../reference/associated_executor.html" title="associated_executor">associated_executor</a>
                    trait, <code class="computeroutput"><span class="identifier">associated_executor_t</span></code>
                    type alias, and <a class="link" href="../../reference/get_associated_executor.html" title="get_associated_executor">get_associated_executor</a>
                    function
                  </p>
                </td>
<td>
                  <p>
                    Defines an asynchronous agent’s associated executor.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../../reference/associated_allocator.html" title="associated_allocator">associated_allocator</a>
                    trait, <code class="computeroutput"><span class="identifier">associated_allocator_t</span></code>
                    type alias, and <a class="link" href="../../reference/get_associated_allocator.html" title="get_associated_allocator">get_associated_allocator</a>
                    function
                  </p>
                </td>
<td>
                  <p>
                    Defines an asynchronous agent’s associated allocator.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../../reference/associated_cancellation_slot.html" title="associated_cancellation_slot">associated_cancellation_slot</a>
                    trait, <code class="computeroutput"><span class="identifier">associated_cancellation_slot_t</span></code>
                    type alias, and <a class="link" href="../../reference/get_associated_cancellation_slot.html" title="get_associated_cancellation_slot">get_associated_cancellation_slot</a>
                    function
                  </p>
                </td>
<td>
                  <p>
                    Defines an asynchronous agent’s associated cancellation slot.
                  </p>
                </td>
</tr>
</tbody>
</table></div>
</div>
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